Improvised Gun Barrels

Tube sizes for improvised firearm barrels from .22 rimfire to 12 gauge shotgun. Seamless Mechanical Tube (SMT) and Seamless Hydraulic Tube (SHT).

CALIBRE

TUBE SIZE REQUIRED (mm)

CALIBRE

TUBE SIZE REQUIRED (mm)

.22 Rimfire

9.53

x

2.03

(SMT)

5.47

9.52

x

2.03

(SHT)

5.46

.25 ACP

12.70

x

3.25

(SMT)

6.20

.32 ACP

14.29

x

3.25

(SMT)

7.79

.38/.357

15.88

x

3.25

(SMT/SHT)

9.38

19.05

x

4.88

(SMT)

9.29

9mm/.380

14.29

x

2.64

(SMT)

9.01

14.00

x

2.50

(SHT)

9.00

15.00

x

3.00

(SHT)

9.00

.44/.410

20.64

x

4.88

(SMT)

10.88

19.05

x

4.06

(SMT)

10.93

.45 ACP

17.46

x

2.95

(SHT)

11.56

12 Gauge

26.99

x

4.06

(SMT)

18.87

28.58

x

4.06

(SMT)

20.46

28.00

x

4.00

(SHT)

20.00

30.00

x

5.00

(SHT)

20.00

All the tube sizes listed here offer an excellent 'Bullet to Bore' fit. All will require chambering with the appropriate calibre of chamber reamer.

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